Frequencies for first 10,000 rows of pct012c180 variable in sf12000860us18 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,585       95.85       95.85
          1 |        335        3.35       99.20
          2 |         50        0.50       99.70
          3 |         13        0.13       99.83
          4 |          5        0.05       99.88
          5 |          1        0.01       99.89
          6 |          2        0.02       99.91
          7 |          1        0.01       99.92
          8 |          1        0.01       99.93
          9 |          1        0.01       99.94
         11 |          1        0.01       99.95
         12 |          1        0.01       99.96
         17 |          1        0.01       99.97
         21 |          1        0.01       99.98
         23 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017